summaryrefslogtreecommitdiff
path: root/sound/core/memalloc.c
blob: 753d5fc4b284fa66cd0f3911d4096322fd7b3bf9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Takashi Iwai <tiwai@suse.de>
 * 
 *  Generic memory allocators
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/genalloc.h>
#include <sound/memalloc.h>

/*
 *
 *  Generic memory allocators
 *
 */

/**
 * snd_malloc_pages - allocate pages with the given size
 * @size: the size to allocate in bytes
 * @gfp_flags: the allocation conditions, GFP_XXX
 *
 * Allocates the physically contiguous pages with the given size.
 *
 * Return: The pointer of the buffer, or %NULL if no enough memory.
 */
void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
{
	int pg;

	if (WARN_ON(!size))
		return NULL;
	if (WARN_ON(!gfp_flags))
		return NULL;
	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */
	pg = get_order(size);
	return (void *) __get_free_pages(gfp_flags, pg);
}
EXPORT_SYMBOL(snd_malloc_pages);

/**
 * snd_free_pages - release the pages
 * @ptr: the buffer pointer to release
 * @size: the allocated buffer size
 *
 * Releases the buffer allocated via snd_malloc_pages().
 */
void snd_free_pages(void *ptr, size_t size)
{
	int pg;

	if (ptr == NULL)
		return;
	pg = get_order(size);
	free_pages((unsigned long) ptr, pg);
}
EXPORT_SYMBOL(snd_free_pages);

/*
 *
 *  Bus-specific memory allocators
 *
 */

#ifdef CONFIG_HAS_DMA
/* allocate the coherent DMA pages */
static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
{
	int pg;
	gfp_t gfp_flags;

	if (WARN_ON(!dma))
		return NULL;
	pg = get_order(size);
	gfp_flags = GFP_KERNEL
		| __GFP_COMP	/* compound page lets parts be mapped */
		| __GFP_NORETRY /* don't trigger OOM-killer */
		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
	return dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
}

/* free the coherent DMA pages */
static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
			       dma_addr_t dma)
{
	int pg;

	if (ptr == NULL)
		return;
	pg = get_order(size);
	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
}

#ifdef CONFIG_GENERIC_ALLOCATOR
/**
 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
 * @dmab: buffer allocation record to store the allocated data
 * @size: number of bytes to allocate from the iram
 *
 * This function requires iram phandle provided via of_node
 */
static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
{
	struct device *dev = dmab->dev.dev;
	struct gen_pool *pool = NULL;

	dmab->area = NULL;
	dmab->addr = 0;

	if (dev->of_node)
		pool = of_gen_pool_get(dev->of_node, "iram", 0);

	if (!pool)
		return;

	/* Assign the pool into private_data field */
	dmab->private_data = pool;

	dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
}

/**
 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
 * @dmab: buffer allocation record to store the allocated data
 */
static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
{
	struct gen_pool *pool = dmab->private_data;

	if (pool && dmab->area)
		gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
}
#endif /* CONFIG_GENERIC_ALLOCATOR */
#endif /* CONFIG_HAS_DMA */

/*
 *
 *  ALSA generic memory management
 *
 */


/**
 * snd_dma_alloc_pages - allocate the buffer area according to the given type
 * @type: the DMA buffer type
 * @device: the device pointer
 * @size: the buffer size to allocate
 * @dmab: buffer allocation record to store the allocated data
 *
 * Calls the memory-allocator function for the corresponding
 * buffer type.
 *
 * Return: Zero if the buffer with the given size is allocated successfully,
 * otherwise a negative value on error.
 */
int snd_dma_alloc_pages(int type, struct device *device, size_t size,
			struct snd_dma_buffer *dmab)
{
	if (WARN_ON(!size))
		return -ENXIO;
	if (WARN_ON(!dmab))
		return -ENXIO;

	dmab->dev.type = type;
	dmab->dev.dev = device;
	dmab->bytes = 0;
	switch (type) {
	case SNDRV_DMA_TYPE_CONTINUOUS:
		dmab->area = snd_malloc_pages(size,
					(__force gfp_t)(unsigned long)device);
		dmab->addr = 0;
		break;
#ifdef CONFIG_HAS_DMA
#ifdef CONFIG_GENERIC_ALLOCATOR
	case SNDRV_DMA_TYPE_DEV_IRAM:
		snd_malloc_dev_iram(dmab, size);
		if (dmab->area)
			break;
		/* Internal memory might have limited size and no enough space,
		 * so if we fail to malloc, try to fetch memory traditionally.
		 */
		dmab->dev.type = SNDRV_DMA_TYPE_DEV;
#endif /* CONFIG_GENERIC_ALLOCATOR */
	case SNDRV_DMA_TYPE_DEV:
		dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
		break;
#endif
#ifdef CONFIG_SND_DMA_SGBUF
	case SNDRV_DMA_TYPE_DEV_SG:
		snd_malloc_sgbuf_pages(device, size, dmab, NULL);
		break;
#endif
	default:
		pr_err("snd-malloc: invalid device type %d\n", type);
		dmab->area = NULL;
		dmab->addr = 0;
		return -ENXIO;
	}
	if (! dmab->area)
		return -ENOMEM;
	dmab->bytes = size;
	return 0;
}
EXPORT_SYMBOL(snd_dma_alloc_pages);

/**
 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
 * @type: the DMA buffer type
 * @device: the device pointer
 * @size: the buffer size to allocate
 * @dmab: buffer allocation record to store the allocated data
 *
 * Calls the memory-allocator function for the corresponding
 * buffer type.  When no space is left, this function reduces the size and
 * tries to allocate again.  The size actually allocated is stored in
 * res_size argument.
 *
 * Return: Zero if the buffer with the given size is allocated successfully,
 * otherwise a negative value on error.
 */
int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
				 struct snd_dma_buffer *dmab)
{
	int err;

	while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
		if (err != -ENOMEM)
			return err;
		if (size <= PAGE_SIZE)
			return -ENOMEM;
		size >>= 1;
		size = PAGE_SIZE << get_order(size);
	}
	if (! dmab->area)
		return -ENOMEM;
	return 0;
}
EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);


/**
 * snd_dma_free_pages - release the allocated buffer
 * @dmab: the buffer allocation record to release
 *
 * Releases the allocated buffer via snd_dma_alloc_pages().
 */
void snd_dma_free_pages(struct snd_dma_buffer *dmab)
{
	switch (dmab->dev.type) {
	case SNDRV_DMA_TYPE_CONTINUOUS:
		snd_free_pages(dmab->area, dmab->bytes);
		break;
#ifdef CONFIG_HAS_DMA
#ifdef CONFIG_GENERIC_ALLOCATOR
	case SNDRV_DMA_TYPE_DEV_IRAM:
		snd_free_dev_iram(dmab);
		break;
#endif /* CONFIG_GENERIC_ALLOCATOR */
	case SNDRV_DMA_TYPE_DEV:
		snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
		break;
#endif
#ifdef CONFIG_SND_DMA_SGBUF
	case SNDRV_DMA_TYPE_DEV_SG:
		snd_free_sgbuf_pages(dmab);
		break;
#endif
	default:
		pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
	}
}
EXPORT_SYMBOL(snd_dma_free_pages);